LG ARWN Serie Manual De Instalación página 35

3. When installing 3 outside units
Ex) 5 Indoor Units connected
Ⓐ : Outside Units
Ⓑ : 1st branch(Y branch)
Ⓒ : Y branch
Ⓓ : Indoor Unit
Ⓔ : Connection branch pipe between Outside
units:ARCNN30
Ⓕ : Connection branch pipe between Outside
units:ARCNN20
Ⓖ : Header
Ⓗ : Sealing
Ú Slave2 outside unit ~ Connecting
branch pipe Ⓕ: Pipe diameter
between outside units (F)
Liquid pipe Gas pipe
[mm(inch)] [mm(inch)]
Ø9.52(3/8)/12.7(1/2) Ø22.2(7/8)/28.58(1-1/8)
Ú Slave1 outside unit ~ Connecting
branch pipe Ⓔ : Pipe diameter
between outside units (E)
Liquid pipe Gas pipe
[mm(inch)] [mm(inch)]
Ø15.88(5/8)/19.05(3/4) Ø34.9(1-3/8)/41.3(1-5/8)
Ú Connecting branch pipe Ⓔ ~ 1st Y
branch part Ⓑ: Main pipe diameter (A)
Outside unit capacity Liquid pipe[mm(inch)] Gas pipe [mm(inch)]
40,48,50,60HP Ø19.05(3/4)
Ú Refrigerant pipe diameter from branch
to branch (B, C)
Total capacity of indoor units con-
nected to after branching[kW(Btu/h]
≤ 5.6(19,100)
<16(54,600)
≤ 22.4(76,400)
< 33(112,600)
< 47(160,400)
< 71(242,300)
< 104(354,900)
104(354,900) ≤
Below 2m(6.6ft)
10m or
less
Low/high pressure
common pipe
Ø19.05(3/4)
Low/high pressure
common pipe
Ø19.05(3/4)
Ø41.3(1-5/8)
Liquid pipe Gas pipe
[mm(inch)] [mm(inch)]
Ø6.35(1/4) Ø12.7(1/2)
Ø9.52(3/8) Ø15.88(5/8)
Ø9.52(3/8) Ø19.05(3/4)
Ø9.52(3/8) Ø22.2(7/8)
Ø12.7(1/2) Ø28.58(1-1/8)
Ø15.88(5/8) Ø28.58(1-1/8)
Ø19.05(3/4) Ø34.9(1-3/8)
Ø19.05(3/4) Ø41.3(1-5/8)
Slave2
Slave1
Master
Below 2m Below 2m
(h1) (h1) (h1)
Branch pipe can not be used after header
Ú Total refrigerant pipe length =
A + B + C + a + b + c + d + e ≤ 300m(984ft)
Longest pipe length (Equivalent pipe length)
L
A +B +b,A +C +e ≤ 150m(492ft)( 175m(574ft))
Longest pipe length after 1st branching
ℓ
B +b,C +e ≤ 40m(131ft)
High/Low difference (Outside unit ÷ Indoor unit)
H
H ≤ 50m(164ft)
High/Low difference (Indoor unit ÷ Indoor unit)
h
h ≤ 15m(49ft)
High/Low difference (Outside unit ÷ Outside unit)
h1
h ≤ 2m(6.6ft)
For the first branch pipe (B), use the branch pipe
that fits the main pipe diameter (A).
Refrigerant piping system
L150m(492ft)
l40m(131ft)
Installation Manual 35